1 /*******************************************************************************
2 * Filename: target_core_transport.c
4 * This file contains the Generic Target Engine Core.
6 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
7 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
8 * Copyright (c) 2007-2010 Rising Tide Systems
9 * Copyright (c) 2008-2010 Linux-iSCSI.org
11 * Nicholas A. Bellinger <nab@kernel.org>
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
27 ******************************************************************************/
29 #include <linux/net.h>
30 #include <linux/delay.h>
31 #include <linux/string.h>
32 #include <linux/timer.h>
33 #include <linux/slab.h>
34 #include <linux/blkdev.h>
35 #include <linux/spinlock.h>
36 #include <linux/kthread.h>
38 #include <linux/cdrom.h>
39 #include <linux/module.h>
40 #include <linux/ratelimit.h>
41 #include <asm/unaligned.h>
44 #include <scsi/scsi.h>
45 #include <scsi/scsi_cmnd.h>
46 #include <scsi/scsi_tcq.h>
48 #include <target/target_core_base.h>
49 #include <target/target_core_backend.h>
50 #include <target/target_core_fabric.h>
51 #include <target/target_core_configfs.h>
53 #include "target_core_internal.h"
54 #include "target_core_alua.h"
55 #include "target_core_pr.h"
56 #include "target_core_ua.h"
58 static struct workqueue_struct
*target_completion_wq
;
59 static struct kmem_cache
*se_sess_cache
;
60 struct kmem_cache
*se_ua_cache
;
61 struct kmem_cache
*t10_pr_reg_cache
;
62 struct kmem_cache
*t10_alua_lu_gp_cache
;
63 struct kmem_cache
*t10_alua_lu_gp_mem_cache
;
64 struct kmem_cache
*t10_alua_tg_pt_gp_cache
;
65 struct kmem_cache
*t10_alua_tg_pt_gp_mem_cache
;
67 static void transport_complete_task_attr(struct se_cmd
*cmd
);
68 static void transport_handle_queue_full(struct se_cmd
*cmd
,
69 struct se_device
*dev
);
70 static int transport_generic_get_mem(struct se_cmd
*cmd
);
71 static int target_get_sess_cmd(struct se_session
*, struct se_cmd
*, bool);
72 static void transport_put_cmd(struct se_cmd
*cmd
);
73 static int transport_set_sense_codes(struct se_cmd
*cmd
, u8 asc
, u8 ascq
);
74 static void target_complete_ok_work(struct work_struct
*work
);
76 int init_se_kmem_caches(void)
78 se_sess_cache
= kmem_cache_create("se_sess_cache",
79 sizeof(struct se_session
), __alignof__(struct se_session
),
82 pr_err("kmem_cache_create() for struct se_session"
86 se_ua_cache
= kmem_cache_create("se_ua_cache",
87 sizeof(struct se_ua
), __alignof__(struct se_ua
),
90 pr_err("kmem_cache_create() for struct se_ua failed\n");
91 goto out_free_sess_cache
;
93 t10_pr_reg_cache
= kmem_cache_create("t10_pr_reg_cache",
94 sizeof(struct t10_pr_registration
),
95 __alignof__(struct t10_pr_registration
), 0, NULL
);
96 if (!t10_pr_reg_cache
) {
97 pr_err("kmem_cache_create() for struct t10_pr_registration"
99 goto out_free_ua_cache
;
101 t10_alua_lu_gp_cache
= kmem_cache_create("t10_alua_lu_gp_cache",
102 sizeof(struct t10_alua_lu_gp
), __alignof__(struct t10_alua_lu_gp
),
104 if (!t10_alua_lu_gp_cache
) {
105 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
107 goto out_free_pr_reg_cache
;
109 t10_alua_lu_gp_mem_cache
= kmem_cache_create("t10_alua_lu_gp_mem_cache",
110 sizeof(struct t10_alua_lu_gp_member
),
111 __alignof__(struct t10_alua_lu_gp_member
), 0, NULL
);
112 if (!t10_alua_lu_gp_mem_cache
) {
113 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
115 goto out_free_lu_gp_cache
;
117 t10_alua_tg_pt_gp_cache
= kmem_cache_create("t10_alua_tg_pt_gp_cache",
118 sizeof(struct t10_alua_tg_pt_gp
),
119 __alignof__(struct t10_alua_tg_pt_gp
), 0, NULL
);
120 if (!t10_alua_tg_pt_gp_cache
) {
121 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
123 goto out_free_lu_gp_mem_cache
;
125 t10_alua_tg_pt_gp_mem_cache
= kmem_cache_create(
126 "t10_alua_tg_pt_gp_mem_cache",
127 sizeof(struct t10_alua_tg_pt_gp_member
),
128 __alignof__(struct t10_alua_tg_pt_gp_member
),
130 if (!t10_alua_tg_pt_gp_mem_cache
) {
131 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
133 goto out_free_tg_pt_gp_cache
;
136 target_completion_wq
= alloc_workqueue("target_completion",
138 if (!target_completion_wq
)
139 goto out_free_tg_pt_gp_mem_cache
;
143 out_free_tg_pt_gp_mem_cache
:
144 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
145 out_free_tg_pt_gp_cache
:
146 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
147 out_free_lu_gp_mem_cache
:
148 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
149 out_free_lu_gp_cache
:
150 kmem_cache_destroy(t10_alua_lu_gp_cache
);
151 out_free_pr_reg_cache
:
152 kmem_cache_destroy(t10_pr_reg_cache
);
154 kmem_cache_destroy(se_ua_cache
);
156 kmem_cache_destroy(se_sess_cache
);
161 void release_se_kmem_caches(void)
163 destroy_workqueue(target_completion_wq
);
164 kmem_cache_destroy(se_sess_cache
);
165 kmem_cache_destroy(se_ua_cache
);
166 kmem_cache_destroy(t10_pr_reg_cache
);
167 kmem_cache_destroy(t10_alua_lu_gp_cache
);
168 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
169 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
170 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
173 /* This code ensures unique mib indexes are handed out. */
174 static DEFINE_SPINLOCK(scsi_mib_index_lock
);
175 static u32 scsi_mib_index
[SCSI_INDEX_TYPE_MAX
];
178 * Allocate a new row index for the entry type specified
180 u32
scsi_get_new_index(scsi_index_t type
)
184 BUG_ON((type
< 0) || (type
>= SCSI_INDEX_TYPE_MAX
));
186 spin_lock(&scsi_mib_index_lock
);
187 new_index
= ++scsi_mib_index
[type
];
188 spin_unlock(&scsi_mib_index_lock
);
193 void transport_subsystem_check_init(void)
196 static int sub_api_initialized
;
198 if (sub_api_initialized
)
201 ret
= request_module("target_core_iblock");
203 pr_err("Unable to load target_core_iblock\n");
205 ret
= request_module("target_core_file");
207 pr_err("Unable to load target_core_file\n");
209 ret
= request_module("target_core_pscsi");
211 pr_err("Unable to load target_core_pscsi\n");
213 sub_api_initialized
= 1;
216 struct se_session
*transport_init_session(void)
218 struct se_session
*se_sess
;
220 se_sess
= kmem_cache_zalloc(se_sess_cache
, GFP_KERNEL
);
222 pr_err("Unable to allocate struct se_session from"
224 return ERR_PTR(-ENOMEM
);
226 INIT_LIST_HEAD(&se_sess
->sess_list
);
227 INIT_LIST_HEAD(&se_sess
->sess_acl_list
);
228 INIT_LIST_HEAD(&se_sess
->sess_cmd_list
);
229 spin_lock_init(&se_sess
->sess_cmd_lock
);
230 kref_init(&se_sess
->sess_kref
);
234 EXPORT_SYMBOL(transport_init_session
);
237 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
239 void __transport_register_session(
240 struct se_portal_group
*se_tpg
,
241 struct se_node_acl
*se_nacl
,
242 struct se_session
*se_sess
,
243 void *fabric_sess_ptr
)
245 unsigned char buf
[PR_REG_ISID_LEN
];
247 se_sess
->se_tpg
= se_tpg
;
248 se_sess
->fabric_sess_ptr
= fabric_sess_ptr
;
250 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
252 * Only set for struct se_session's that will actually be moving I/O.
253 * eg: *NOT* discovery sessions.
257 * If the fabric module supports an ISID based TransportID,
258 * save this value in binary from the fabric I_T Nexus now.
260 if (se_tpg
->se_tpg_tfo
->sess_get_initiator_sid
!= NULL
) {
261 memset(&buf
[0], 0, PR_REG_ISID_LEN
);
262 se_tpg
->se_tpg_tfo
->sess_get_initiator_sid(se_sess
,
263 &buf
[0], PR_REG_ISID_LEN
);
264 se_sess
->sess_bin_isid
= get_unaligned_be64(&buf
[0]);
266 kref_get(&se_nacl
->acl_kref
);
268 spin_lock_irq(&se_nacl
->nacl_sess_lock
);
270 * The se_nacl->nacl_sess pointer will be set to the
271 * last active I_T Nexus for each struct se_node_acl.
273 se_nacl
->nacl_sess
= se_sess
;
275 list_add_tail(&se_sess
->sess_acl_list
,
276 &se_nacl
->acl_sess_list
);
277 spin_unlock_irq(&se_nacl
->nacl_sess_lock
);
279 list_add_tail(&se_sess
->sess_list
, &se_tpg
->tpg_sess_list
);
281 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
282 se_tpg
->se_tpg_tfo
->get_fabric_name(), se_sess
->fabric_sess_ptr
);
284 EXPORT_SYMBOL(__transport_register_session
);
286 void transport_register_session(
287 struct se_portal_group
*se_tpg
,
288 struct se_node_acl
*se_nacl
,
289 struct se_session
*se_sess
,
290 void *fabric_sess_ptr
)
294 spin_lock_irqsave(&se_tpg
->session_lock
, flags
);
295 __transport_register_session(se_tpg
, se_nacl
, se_sess
, fabric_sess_ptr
);
296 spin_unlock_irqrestore(&se_tpg
->session_lock
, flags
);
298 EXPORT_SYMBOL(transport_register_session
);
300 void target_release_session(struct kref
*kref
)
302 struct se_session
*se_sess
= container_of(kref
,
303 struct se_session
, sess_kref
);
304 struct se_portal_group
*se_tpg
= se_sess
->se_tpg
;
306 se_tpg
->se_tpg_tfo
->close_session(se_sess
);
309 void target_get_session(struct se_session
*se_sess
)
311 kref_get(&se_sess
->sess_kref
);
313 EXPORT_SYMBOL(target_get_session
);
315 void target_put_session(struct se_session
*se_sess
)
317 struct se_portal_group
*tpg
= se_sess
->se_tpg
;
319 if (tpg
->se_tpg_tfo
->put_session
!= NULL
) {
320 tpg
->se_tpg_tfo
->put_session(se_sess
);
323 kref_put(&se_sess
->sess_kref
, target_release_session
);
325 EXPORT_SYMBOL(target_put_session
);
327 static void target_complete_nacl(struct kref
*kref
)
329 struct se_node_acl
*nacl
= container_of(kref
,
330 struct se_node_acl
, acl_kref
);
332 complete(&nacl
->acl_free_comp
);
335 void target_put_nacl(struct se_node_acl
*nacl
)
337 kref_put(&nacl
->acl_kref
, target_complete_nacl
);
340 void transport_deregister_session_configfs(struct se_session
*se_sess
)
342 struct se_node_acl
*se_nacl
;
345 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
347 se_nacl
= se_sess
->se_node_acl
;
349 spin_lock_irqsave(&se_nacl
->nacl_sess_lock
, flags
);
350 if (se_nacl
->acl_stop
== 0)
351 list_del(&se_sess
->sess_acl_list
);
353 * If the session list is empty, then clear the pointer.
354 * Otherwise, set the struct se_session pointer from the tail
355 * element of the per struct se_node_acl active session list.
357 if (list_empty(&se_nacl
->acl_sess_list
))
358 se_nacl
->nacl_sess
= NULL
;
360 se_nacl
->nacl_sess
= container_of(
361 se_nacl
->acl_sess_list
.prev
,
362 struct se_session
, sess_acl_list
);
364 spin_unlock_irqrestore(&se_nacl
->nacl_sess_lock
, flags
);
367 EXPORT_SYMBOL(transport_deregister_session_configfs
);
369 void transport_free_session(struct se_session
*se_sess
)
371 kmem_cache_free(se_sess_cache
, se_sess
);
373 EXPORT_SYMBOL(transport_free_session
);
375 void transport_deregister_session(struct se_session
*se_sess
)
377 struct se_portal_group
*se_tpg
= se_sess
->se_tpg
;
378 struct target_core_fabric_ops
*se_tfo
;
379 struct se_node_acl
*se_nacl
;
381 bool comp_nacl
= true;
384 transport_free_session(se_sess
);
387 se_tfo
= se_tpg
->se_tpg_tfo
;
389 spin_lock_irqsave(&se_tpg
->session_lock
, flags
);
390 list_del(&se_sess
->sess_list
);
391 se_sess
->se_tpg
= NULL
;
392 se_sess
->fabric_sess_ptr
= NULL
;
393 spin_unlock_irqrestore(&se_tpg
->session_lock
, flags
);
396 * Determine if we need to do extra work for this initiator node's
397 * struct se_node_acl if it had been previously dynamically generated.
399 se_nacl
= se_sess
->se_node_acl
;
401 spin_lock_irqsave(&se_tpg
->acl_node_lock
, flags
);
402 if (se_nacl
&& se_nacl
->dynamic_node_acl
) {
403 if (!se_tfo
->tpg_check_demo_mode_cache(se_tpg
)) {
404 list_del(&se_nacl
->acl_list
);
405 se_tpg
->num_node_acls
--;
406 spin_unlock_irqrestore(&se_tpg
->acl_node_lock
, flags
);
407 core_tpg_wait_for_nacl_pr_ref(se_nacl
);
408 core_free_device_list_for_node(se_nacl
, se_tpg
);
409 se_tfo
->tpg_release_fabric_acl(se_tpg
, se_nacl
);
412 spin_lock_irqsave(&se_tpg
->acl_node_lock
, flags
);
415 spin_unlock_irqrestore(&se_tpg
->acl_node_lock
, flags
);
417 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
418 se_tpg
->se_tpg_tfo
->get_fabric_name());
420 * If last kref is dropping now for an explict NodeACL, awake sleeping
421 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
424 if (se_nacl
&& comp_nacl
== true)
425 target_put_nacl(se_nacl
);
427 transport_free_session(se_sess
);
429 EXPORT_SYMBOL(transport_deregister_session
);
432 * Called with cmd->t_state_lock held.
434 static void target_remove_from_state_list(struct se_cmd
*cmd
)
436 struct se_device
*dev
= cmd
->se_dev
;
442 if (cmd
->transport_state
& CMD_T_BUSY
)
445 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
446 if (cmd
->state_active
) {
447 list_del(&cmd
->state_list
);
448 cmd
->state_active
= false;
450 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
453 static int transport_cmd_check_stop(struct se_cmd
*cmd
, bool remove_from_lists
)
457 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
459 * Determine if IOCTL context caller in requesting the stopping of this
460 * command for LUN shutdown purposes.
462 if (cmd
->transport_state
& CMD_T_LUN_STOP
) {
463 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
464 __func__
, __LINE__
, cmd
->se_tfo
->get_task_tag(cmd
));
466 cmd
->transport_state
&= ~CMD_T_ACTIVE
;
467 if (remove_from_lists
)
468 target_remove_from_state_list(cmd
);
469 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
471 complete(&cmd
->transport_lun_stop_comp
);
475 if (remove_from_lists
) {
476 target_remove_from_state_list(cmd
);
479 * Clear struct se_cmd->se_lun before the handoff to FE.
485 * Determine if frontend context caller is requesting the stopping of
486 * this command for frontend exceptions.
488 if (cmd
->transport_state
& CMD_T_STOP
) {
489 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
491 cmd
->se_tfo
->get_task_tag(cmd
));
493 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
495 complete(&cmd
->t_transport_stop_comp
);
499 cmd
->transport_state
&= ~CMD_T_ACTIVE
;
500 if (remove_from_lists
) {
502 * Some fabric modules like tcm_loop can release
503 * their internally allocated I/O reference now and
506 * Fabric modules are expected to return '1' here if the
507 * se_cmd being passed is released at this point,
508 * or zero if not being released.
510 if (cmd
->se_tfo
->check_stop_free
!= NULL
) {
511 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
512 return cmd
->se_tfo
->check_stop_free(cmd
);
516 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
520 static int transport_cmd_check_stop_to_fabric(struct se_cmd
*cmd
)
522 return transport_cmd_check_stop(cmd
, true);
525 static void transport_lun_remove_cmd(struct se_cmd
*cmd
)
527 struct se_lun
*lun
= cmd
->se_lun
;
533 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
534 if (cmd
->transport_state
& CMD_T_DEV_ACTIVE
) {
535 cmd
->transport_state
&= ~CMD_T_DEV_ACTIVE
;
536 target_remove_from_state_list(cmd
);
538 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
540 spin_lock_irqsave(&lun
->lun_cmd_lock
, flags
);
541 if (!list_empty(&cmd
->se_lun_node
))
542 list_del_init(&cmd
->se_lun_node
);
543 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, flags
);
546 void transport_cmd_finish_abort(struct se_cmd
*cmd
, int remove
)
548 if (!(cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
))
549 transport_lun_remove_cmd(cmd
);
551 if (transport_cmd_check_stop_to_fabric(cmd
))
554 transport_put_cmd(cmd
);
557 static void target_complete_failure_work(struct work_struct
*work
)
559 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
561 transport_generic_request_failure(cmd
);
565 * Used when asking transport to copy Sense Data from the underlying
566 * Linux/SCSI struct scsi_cmnd
568 static unsigned char *transport_get_sense_buffer(struct se_cmd
*cmd
)
570 struct se_device
*dev
= cmd
->se_dev
;
572 WARN_ON(!cmd
->se_lun
);
577 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
)
580 cmd
->scsi_sense_length
= TRANSPORT_SENSE_BUFFER
;
582 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
583 dev
->se_hba
->hba_id
, dev
->transport
->name
, cmd
->scsi_status
);
584 return cmd
->sense_buffer
;
587 void target_complete_cmd(struct se_cmd
*cmd
, u8 scsi_status
)
589 struct se_device
*dev
= cmd
->se_dev
;
590 int success
= scsi_status
== GOOD
;
593 cmd
->scsi_status
= scsi_status
;
596 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
597 cmd
->transport_state
&= ~CMD_T_BUSY
;
599 if (dev
&& dev
->transport
->transport_complete
) {
600 dev
->transport
->transport_complete(cmd
,
602 transport_get_sense_buffer(cmd
));
603 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
)
608 * See if we are waiting to complete for an exception condition.
610 if (cmd
->transport_state
& CMD_T_REQUEST_STOP
) {
611 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
612 complete(&cmd
->task_stop_comp
);
617 cmd
->transport_state
|= CMD_T_FAILED
;
620 * Check for case where an explict ABORT_TASK has been received
621 * and transport_wait_for_tasks() will be waiting for completion..
623 if (cmd
->transport_state
& CMD_T_ABORTED
&&
624 cmd
->transport_state
& CMD_T_STOP
) {
625 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
626 complete(&cmd
->t_transport_stop_comp
);
628 } else if (cmd
->transport_state
& CMD_T_FAILED
) {
629 cmd
->scsi_sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
630 INIT_WORK(&cmd
->work
, target_complete_failure_work
);
632 INIT_WORK(&cmd
->work
, target_complete_ok_work
);
635 cmd
->t_state
= TRANSPORT_COMPLETE
;
636 cmd
->transport_state
|= (CMD_T_COMPLETE
| CMD_T_ACTIVE
);
637 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
639 queue_work(target_completion_wq
, &cmd
->work
);
641 EXPORT_SYMBOL(target_complete_cmd
);
643 static void target_add_to_state_list(struct se_cmd
*cmd
)
645 struct se_device
*dev
= cmd
->se_dev
;
648 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
649 if (!cmd
->state_active
) {
650 list_add_tail(&cmd
->state_list
, &dev
->state_list
);
651 cmd
->state_active
= true;
653 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
657 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
659 static void transport_write_pending_qf(struct se_cmd
*cmd
);
660 static void transport_complete_qf(struct se_cmd
*cmd
);
662 static void target_qf_do_work(struct work_struct
*work
)
664 struct se_device
*dev
= container_of(work
, struct se_device
,
666 LIST_HEAD(qf_cmd_list
);
667 struct se_cmd
*cmd
, *cmd_tmp
;
669 spin_lock_irq(&dev
->qf_cmd_lock
);
670 list_splice_init(&dev
->qf_cmd_list
, &qf_cmd_list
);
671 spin_unlock_irq(&dev
->qf_cmd_lock
);
673 list_for_each_entry_safe(cmd
, cmd_tmp
, &qf_cmd_list
, se_qf_node
) {
674 list_del(&cmd
->se_qf_node
);
675 atomic_dec(&dev
->dev_qf_count
);
676 smp_mb__after_atomic_dec();
678 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
679 " context: %s\n", cmd
->se_tfo
->get_fabric_name(), cmd
,
680 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_OK
) ? "COMPLETE_OK" :
681 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_WP
) ? "WRITE_PENDING"
684 if (cmd
->t_state
== TRANSPORT_COMPLETE_QF_WP
)
685 transport_write_pending_qf(cmd
);
686 else if (cmd
->t_state
== TRANSPORT_COMPLETE_QF_OK
)
687 transport_complete_qf(cmd
);
691 unsigned char *transport_dump_cmd_direction(struct se_cmd
*cmd
)
693 switch (cmd
->data_direction
) {
696 case DMA_FROM_DEVICE
:
700 case DMA_BIDIRECTIONAL
:
709 void transport_dump_dev_state(
710 struct se_device
*dev
,
714 *bl
+= sprintf(b
+ *bl
, "Status: ");
715 switch (dev
->dev_status
) {
716 case TRANSPORT_DEVICE_ACTIVATED
:
717 *bl
+= sprintf(b
+ *bl
, "ACTIVATED");
719 case TRANSPORT_DEVICE_DEACTIVATED
:
720 *bl
+= sprintf(b
+ *bl
, "DEACTIVATED");
722 case TRANSPORT_DEVICE_SHUTDOWN
:
723 *bl
+= sprintf(b
+ *bl
, "SHUTDOWN");
725 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED
:
726 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED
:
727 *bl
+= sprintf(b
+ *bl
, "OFFLINE");
730 *bl
+= sprintf(b
+ *bl
, "UNKNOWN=%d", dev
->dev_status
);
734 *bl
+= sprintf(b
+ *bl
, " Max Queue Depth: %d", dev
->queue_depth
);
735 *bl
+= sprintf(b
+ *bl
, " SectorSize: %u HwMaxSectors: %u\n",
736 dev
->se_sub_dev
->se_dev_attrib
.block_size
,
737 dev
->se_sub_dev
->se_dev_attrib
.hw_max_sectors
);
738 *bl
+= sprintf(b
+ *bl
, " ");
741 void transport_dump_vpd_proto_id(
743 unsigned char *p_buf
,
746 unsigned char buf
[VPD_TMP_BUF_SIZE
];
749 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
750 len
= sprintf(buf
, "T10 VPD Protocol Identifier: ");
752 switch (vpd
->protocol_identifier
) {
754 sprintf(buf
+len
, "Fibre Channel\n");
757 sprintf(buf
+len
, "Parallel SCSI\n");
760 sprintf(buf
+len
, "SSA\n");
763 sprintf(buf
+len
, "IEEE 1394\n");
766 sprintf(buf
+len
, "SCSI Remote Direct Memory Access"
770 sprintf(buf
+len
, "Internet SCSI (iSCSI)\n");
773 sprintf(buf
+len
, "SAS Serial SCSI Protocol\n");
776 sprintf(buf
+len
, "Automation/Drive Interface Transport"
780 sprintf(buf
+len
, "AT Attachment Interface ATA/ATAPI\n");
783 sprintf(buf
+len
, "Unknown 0x%02x\n",
784 vpd
->protocol_identifier
);
789 strncpy(p_buf
, buf
, p_buf_len
);
795 transport_set_vpd_proto_id(struct t10_vpd
*vpd
, unsigned char *page_83
)
798 * Check if the Protocol Identifier Valid (PIV) bit is set..
800 * from spc3r23.pdf section 7.5.1
802 if (page_83
[1] & 0x80) {
803 vpd
->protocol_identifier
= (page_83
[0] & 0xf0);
804 vpd
->protocol_identifier_set
= 1;
805 transport_dump_vpd_proto_id(vpd
, NULL
, 0);
808 EXPORT_SYMBOL(transport_set_vpd_proto_id
);
810 int transport_dump_vpd_assoc(
812 unsigned char *p_buf
,
815 unsigned char buf
[VPD_TMP_BUF_SIZE
];
819 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
820 len
= sprintf(buf
, "T10 VPD Identifier Association: ");
822 switch (vpd
->association
) {
824 sprintf(buf
+len
, "addressed logical unit\n");
827 sprintf(buf
+len
, "target port\n");
830 sprintf(buf
+len
, "SCSI target device\n");
833 sprintf(buf
+len
, "Unknown 0x%02x\n", vpd
->association
);
839 strncpy(p_buf
, buf
, p_buf_len
);
846 int transport_set_vpd_assoc(struct t10_vpd
*vpd
, unsigned char *page_83
)
849 * The VPD identification association..
851 * from spc3r23.pdf Section 7.6.3.1 Table 297
853 vpd
->association
= (page_83
[1] & 0x30);
854 return transport_dump_vpd_assoc(vpd
, NULL
, 0);
856 EXPORT_SYMBOL(transport_set_vpd_assoc
);
858 int transport_dump_vpd_ident_type(
860 unsigned char *p_buf
,
863 unsigned char buf
[VPD_TMP_BUF_SIZE
];
867 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
868 len
= sprintf(buf
, "T10 VPD Identifier Type: ");
870 switch (vpd
->device_identifier_type
) {
872 sprintf(buf
+len
, "Vendor specific\n");
875 sprintf(buf
+len
, "T10 Vendor ID based\n");
878 sprintf(buf
+len
, "EUI-64 based\n");
881 sprintf(buf
+len
, "NAA\n");
884 sprintf(buf
+len
, "Relative target port identifier\n");
887 sprintf(buf
+len
, "SCSI name string\n");
890 sprintf(buf
+len
, "Unsupported: 0x%02x\n",
891 vpd
->device_identifier_type
);
897 if (p_buf_len
< strlen(buf
)+1)
899 strncpy(p_buf
, buf
, p_buf_len
);
907 int transport_set_vpd_ident_type(struct t10_vpd
*vpd
, unsigned char *page_83
)
910 * The VPD identifier type..
912 * from spc3r23.pdf Section 7.6.3.1 Table 298
914 vpd
->device_identifier_type
= (page_83
[1] & 0x0f);
915 return transport_dump_vpd_ident_type(vpd
, NULL
, 0);
917 EXPORT_SYMBOL(transport_set_vpd_ident_type
);
919 int transport_dump_vpd_ident(
921 unsigned char *p_buf
,
924 unsigned char buf
[VPD_TMP_BUF_SIZE
];
927 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
929 switch (vpd
->device_identifier_code_set
) {
930 case 0x01: /* Binary */
931 sprintf(buf
, "T10 VPD Binary Device Identifier: %s\n",
932 &vpd
->device_identifier
[0]);
934 case 0x02: /* ASCII */
935 sprintf(buf
, "T10 VPD ASCII Device Identifier: %s\n",
936 &vpd
->device_identifier
[0]);
938 case 0x03: /* UTF-8 */
939 sprintf(buf
, "T10 VPD UTF-8 Device Identifier: %s\n",
940 &vpd
->device_identifier
[0]);
943 sprintf(buf
, "T10 VPD Device Identifier encoding unsupported:"
944 " 0x%02x", vpd
->device_identifier_code_set
);
950 strncpy(p_buf
, buf
, p_buf_len
);
958 transport_set_vpd_ident(struct t10_vpd
*vpd
, unsigned char *page_83
)
960 static const char hex_str
[] = "0123456789abcdef";
961 int j
= 0, i
= 4; /* offset to start of the identifier */
964 * The VPD Code Set (encoding)
966 * from spc3r23.pdf Section 7.6.3.1 Table 296
968 vpd
->device_identifier_code_set
= (page_83
[0] & 0x0f);
969 switch (vpd
->device_identifier_code_set
) {
970 case 0x01: /* Binary */
971 vpd
->device_identifier
[j
++] =
972 hex_str
[vpd
->device_identifier_type
];
973 while (i
< (4 + page_83
[3])) {
974 vpd
->device_identifier
[j
++] =
975 hex_str
[(page_83
[i
] & 0xf0) >> 4];
976 vpd
->device_identifier
[j
++] =
977 hex_str
[page_83
[i
] & 0x0f];
981 case 0x02: /* ASCII */
982 case 0x03: /* UTF-8 */
983 while (i
< (4 + page_83
[3]))
984 vpd
->device_identifier
[j
++] = page_83
[i
++];
990 return transport_dump_vpd_ident(vpd
, NULL
, 0);
992 EXPORT_SYMBOL(transport_set_vpd_ident
);
994 static void core_setup_task_attr_emulation(struct se_device
*dev
)
997 * If this device is from Target_Core_Mod/pSCSI, disable the
998 * SAM Task Attribute emulation.
1000 * This is currently not available in upsream Linux/SCSI Target
1001 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1003 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
) {
1004 dev
->dev_task_attr_type
= SAM_TASK_ATTR_PASSTHROUGH
;
1008 dev
->dev_task_attr_type
= SAM_TASK_ATTR_EMULATED
;
1009 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1010 " device\n", dev
->transport
->name
,
1011 dev
->transport
->get_device_rev(dev
));
1014 static void scsi_dump_inquiry(struct se_device
*dev
)
1016 struct t10_wwn
*wwn
= &dev
->se_sub_dev
->t10_wwn
;
1020 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1022 for (i
= 0; i
< 8; i
++)
1023 if (wwn
->vendor
[i
] >= 0x20)
1024 buf
[i
] = wwn
->vendor
[i
];
1028 pr_debug(" Vendor: %s\n", buf
);
1030 for (i
= 0; i
< 16; i
++)
1031 if (wwn
->model
[i
] >= 0x20)
1032 buf
[i
] = wwn
->model
[i
];
1036 pr_debug(" Model: %s\n", buf
);
1038 for (i
= 0; i
< 4; i
++)
1039 if (wwn
->revision
[i
] >= 0x20)
1040 buf
[i
] = wwn
->revision
[i
];
1044 pr_debug(" Revision: %s\n", buf
);
1046 device_type
= dev
->transport
->get_device_type(dev
);
1047 pr_debug(" Type: %s ", scsi_device_type(device_type
));
1048 pr_debug(" ANSI SCSI revision: %02x\n",
1049 dev
->transport
->get_device_rev(dev
));
1052 struct se_device
*transport_add_device_to_core_hba(
1054 struct se_subsystem_api
*transport
,
1055 struct se_subsystem_dev
*se_dev
,
1057 void *transport_dev
,
1058 struct se_dev_limits
*dev_limits
,
1059 const char *inquiry_prod
,
1060 const char *inquiry_rev
)
1063 struct se_device
*dev
;
1065 dev
= kzalloc(sizeof(struct se_device
), GFP_KERNEL
);
1067 pr_err("Unable to allocate memory for se_dev_t\n");
1071 dev
->dev_flags
= device_flags
;
1072 dev
->dev_status
|= TRANSPORT_DEVICE_DEACTIVATED
;
1073 dev
->dev_ptr
= transport_dev
;
1075 dev
->se_sub_dev
= se_dev
;
1076 dev
->transport
= transport
;
1077 INIT_LIST_HEAD(&dev
->dev_list
);
1078 INIT_LIST_HEAD(&dev
->dev_sep_list
);
1079 INIT_LIST_HEAD(&dev
->dev_tmr_list
);
1080 INIT_LIST_HEAD(&dev
->delayed_cmd_list
);
1081 INIT_LIST_HEAD(&dev
->state_list
);
1082 INIT_LIST_HEAD(&dev
->qf_cmd_list
);
1083 spin_lock_init(&dev
->execute_task_lock
);
1084 spin_lock_init(&dev
->delayed_cmd_lock
);
1085 spin_lock_init(&dev
->dev_reservation_lock
);
1086 spin_lock_init(&dev
->dev_status_lock
);
1087 spin_lock_init(&dev
->se_port_lock
);
1088 spin_lock_init(&dev
->se_tmr_lock
);
1089 spin_lock_init(&dev
->qf_cmd_lock
);
1090 atomic_set(&dev
->dev_ordered_id
, 0);
1092 se_dev_set_default_attribs(dev
, dev_limits
);
1094 dev
->dev_index
= scsi_get_new_index(SCSI_DEVICE_INDEX
);
1095 dev
->creation_time
= get_jiffies_64();
1096 spin_lock_init(&dev
->stats_lock
);
1098 spin_lock(&hba
->device_lock
);
1099 list_add_tail(&dev
->dev_list
, &hba
->hba_dev_list
);
1101 spin_unlock(&hba
->device_lock
);
1103 * Setup the SAM Task Attribute emulation for struct se_device
1105 core_setup_task_attr_emulation(dev
);
1107 * Force PR and ALUA passthrough emulation with internal object use.
1109 force_pt
= (hba
->hba_flags
& HBA_FLAGS_INTERNAL_USE
);
1111 * Setup the Reservations infrastructure for struct se_device
1113 core_setup_reservations(dev
, force_pt
);
1115 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1117 if (core_setup_alua(dev
, force_pt
) < 0)
1121 * Startup the struct se_device processing thread
1123 dev
->tmr_wq
= alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM
| WQ_UNBOUND
, 1,
1124 dev
->transport
->name
);
1126 pr_err("Unable to create tmr workqueue for %s\n",
1127 dev
->transport
->name
);
1131 * Setup work_queue for QUEUE_FULL
1133 INIT_WORK(&dev
->qf_work_queue
, target_qf_do_work
);
1135 * Preload the initial INQUIRY const values if we are doing
1136 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1137 * passthrough because this is being provided by the backend LLD.
1138 * This is required so that transport_get_inquiry() copies these
1139 * originals once back into DEV_T10_WWN(dev) for the virtual device
1142 if (dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
) {
1143 if (!inquiry_prod
|| !inquiry_rev
) {
1144 pr_err("All non TCM/pSCSI plugins require"
1145 " INQUIRY consts\n");
1149 strncpy(&dev
->se_sub_dev
->t10_wwn
.vendor
[0], "LIO-ORG", 8);
1150 strncpy(&dev
->se_sub_dev
->t10_wwn
.model
[0], inquiry_prod
, 16);
1151 strncpy(&dev
->se_sub_dev
->t10_wwn
.revision
[0], inquiry_rev
, 4);
1153 scsi_dump_inquiry(dev
);
1158 destroy_workqueue(dev
->tmr_wq
);
1160 spin_lock(&hba
->device_lock
);
1161 list_del(&dev
->dev_list
);
1163 spin_unlock(&hba
->device_lock
);
1165 se_release_vpd_for_dev(dev
);
1171 EXPORT_SYMBOL(transport_add_device_to_core_hba
);
1173 int target_cmd_size_check(struct se_cmd
*cmd
, unsigned int size
)
1175 struct se_device
*dev
= cmd
->se_dev
;
1177 if (cmd
->unknown_data_length
) {
1178 cmd
->data_length
= size
;
1179 } else if (size
!= cmd
->data_length
) {
1180 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1181 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1182 " 0x%02x\n", cmd
->se_tfo
->get_fabric_name(),
1183 cmd
->data_length
, size
, cmd
->t_task_cdb
[0]);
1185 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
1186 pr_err("Rejecting underflow/overflow"
1188 goto out_invalid_cdb_field
;
1191 * Reject READ_* or WRITE_* with overflow/underflow for
1192 * type SCF_SCSI_DATA_CDB.
1194 if (dev
->se_sub_dev
->se_dev_attrib
.block_size
!= 512) {
1195 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1196 " CDB on non 512-byte sector setup subsystem"
1197 " plugin: %s\n", dev
->transport
->name
);
1198 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1199 goto out_invalid_cdb_field
;
1202 * For the overflow case keep the existing fabric provided
1203 * ->data_length. Otherwise for the underflow case, reset
1204 * ->data_length to the smaller SCSI expected data transfer
1207 if (size
> cmd
->data_length
) {
1208 cmd
->se_cmd_flags
|= SCF_OVERFLOW_BIT
;
1209 cmd
->residual_count
= (size
- cmd
->data_length
);
1211 cmd
->se_cmd_flags
|= SCF_UNDERFLOW_BIT
;
1212 cmd
->residual_count
= (cmd
->data_length
- size
);
1213 cmd
->data_length
= size
;
1219 out_invalid_cdb_field
:
1220 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1221 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1226 * Used by fabric modules containing a local struct se_cmd within their
1227 * fabric dependent per I/O descriptor.
1229 void transport_init_se_cmd(
1231 struct target_core_fabric_ops
*tfo
,
1232 struct se_session
*se_sess
,
1236 unsigned char *sense_buffer
)
1238 INIT_LIST_HEAD(&cmd
->se_lun_node
);
1239 INIT_LIST_HEAD(&cmd
->se_delayed_node
);
1240 INIT_LIST_HEAD(&cmd
->se_qf_node
);
1241 INIT_LIST_HEAD(&cmd
->se_cmd_list
);
1242 INIT_LIST_HEAD(&cmd
->state_list
);
1243 init_completion(&cmd
->transport_lun_fe_stop_comp
);
1244 init_completion(&cmd
->transport_lun_stop_comp
);
1245 init_completion(&cmd
->t_transport_stop_comp
);
1246 init_completion(&cmd
->cmd_wait_comp
);
1247 init_completion(&cmd
->task_stop_comp
);
1248 spin_lock_init(&cmd
->t_state_lock
);
1249 cmd
->transport_state
= CMD_T_DEV_ACTIVE
;
1252 cmd
->se_sess
= se_sess
;
1253 cmd
->data_length
= data_length
;
1254 cmd
->data_direction
= data_direction
;
1255 cmd
->sam_task_attr
= task_attr
;
1256 cmd
->sense_buffer
= sense_buffer
;
1258 cmd
->state_active
= false;
1260 EXPORT_SYMBOL(transport_init_se_cmd
);
1262 static int transport_check_alloc_task_attr(struct se_cmd
*cmd
)
1265 * Check if SAM Task Attribute emulation is enabled for this
1266 * struct se_device storage object
1268 if (cmd
->se_dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
1271 if (cmd
->sam_task_attr
== MSG_ACA_TAG
) {
1272 pr_debug("SAM Task Attribute ACA"
1273 " emulation is not supported\n");
1277 * Used to determine when ORDERED commands should go from
1278 * Dormant to Active status.
1280 cmd
->se_ordered_id
= atomic_inc_return(&cmd
->se_dev
->dev_ordered_id
);
1281 smp_mb__after_atomic_inc();
1282 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1283 cmd
->se_ordered_id
, cmd
->sam_task_attr
,
1284 cmd
->se_dev
->transport
->name
);
1288 /* target_setup_cmd_from_cdb():
1290 * Called from fabric RX Thread.
1292 int target_setup_cmd_from_cdb(
1296 struct se_subsystem_dev
*su_dev
= cmd
->se_dev
->se_sub_dev
;
1297 u32 pr_reg_type
= 0;
1299 unsigned long flags
;
1303 * Ensure that the received CDB is less than the max (252 + 8) bytes
1304 * for VARIABLE_LENGTH_CMD
1306 if (scsi_command_size(cdb
) > SCSI_MAX_VARLEN_CDB_SIZE
) {
1307 pr_err("Received SCSI CDB with command_size: %d that"
1308 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1309 scsi_command_size(cdb
), SCSI_MAX_VARLEN_CDB_SIZE
);
1310 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1311 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1315 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1316 * allocate the additional extended CDB buffer now.. Otherwise
1317 * setup the pointer from __t_task_cdb to t_task_cdb.
1319 if (scsi_command_size(cdb
) > sizeof(cmd
->__t_task_cdb
)) {
1320 cmd
->t_task_cdb
= kzalloc(scsi_command_size(cdb
),
1322 if (!cmd
->t_task_cdb
) {
1323 pr_err("Unable to allocate cmd->t_task_cdb"
1324 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1325 scsi_command_size(cdb
),
1326 (unsigned long)sizeof(cmd
->__t_task_cdb
));
1327 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1328 cmd
->scsi_sense_reason
=
1329 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1333 cmd
->t_task_cdb
= &cmd
->__t_task_cdb
[0];
1335 * Copy the original CDB into cmd->
1337 memcpy(cmd
->t_task_cdb
, cdb
, scsi_command_size(cdb
));
1340 * Check for an existing UNIT ATTENTION condition
1342 if (core_scsi3_ua_check(cmd
, cdb
) < 0) {
1343 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1344 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_UNIT_ATTENTION
;
1348 ret
= su_dev
->t10_alua
.alua_state_check(cmd
, cdb
, &alua_ascq
);
1351 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
1352 * The ALUA additional sense code qualifier (ASCQ) is determined
1353 * by the ALUA primary or secondary access state..
1356 pr_debug("[%s]: ALUA TG Port not available, "
1357 "SenseKey: NOT_READY, ASC/ASCQ: "
1359 cmd
->se_tfo
->get_fabric_name(), alua_ascq
);
1361 transport_set_sense_codes(cmd
, 0x04, alua_ascq
);
1362 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1363 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_NOT_READY
;
1366 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1367 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1372 * Check status for SPC-3 Persistent Reservations
1374 if (su_dev
->t10_pr
.pr_ops
.t10_reservation_check(cmd
, &pr_reg_type
)) {
1375 if (su_dev
->t10_pr
.pr_ops
.t10_seq_non_holder(
1376 cmd
, cdb
, pr_reg_type
) != 0) {
1377 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1378 cmd
->se_cmd_flags
|= SCF_SCSI_RESERVATION_CONFLICT
;
1379 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
1380 cmd
->scsi_sense_reason
= TCM_RESERVATION_CONFLICT
;
1384 * This means the CDB is allowed for the SCSI Initiator port
1385 * when said port is *NOT* holding the legacy SPC-2 or
1386 * SPC-3 Persistent Reservation.
1390 ret
= cmd
->se_dev
->transport
->parse_cdb(cmd
);
1394 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1395 cmd
->se_cmd_flags
|= SCF_SUPPORTED_SAM_OPCODE
;
1396 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
1399 * Check for SAM Task Attribute Emulation
1401 if (transport_check_alloc_task_attr(cmd
) < 0) {
1402 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1403 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1406 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
1407 if (cmd
->se_lun
->lun_sep
)
1408 cmd
->se_lun
->lun_sep
->sep_stats
.cmd_pdus
++;
1409 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
1412 EXPORT_SYMBOL(target_setup_cmd_from_cdb
);
1415 * Used by fabric module frontends to queue tasks directly.
1416 * Many only be used from process context only
1418 int transport_handle_cdb_direct(
1425 pr_err("cmd->se_lun is NULL\n");
1428 if (in_interrupt()) {
1430 pr_err("transport_generic_handle_cdb cannot be called"
1431 " from interrupt context\n");
1435 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1436 * outstanding descriptors are handled correctly during shutdown via
1437 * transport_wait_for_tasks()
1439 * Also, we don't take cmd->t_state_lock here as we only expect
1440 * this to be called for initial descriptor submission.
1442 cmd
->t_state
= TRANSPORT_NEW_CMD
;
1443 cmd
->transport_state
|= CMD_T_ACTIVE
;
1446 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1447 * so follow TRANSPORT_NEW_CMD processing thread context usage
1448 * and call transport_generic_request_failure() if necessary..
1450 ret
= transport_generic_new_cmd(cmd
);
1452 transport_generic_request_failure(cmd
);
1456 EXPORT_SYMBOL(transport_handle_cdb_direct
);
1459 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1460 * se_cmd + use pre-allocated SGL memory.
1462 * @se_cmd: command descriptor to submit
1463 * @se_sess: associated se_sess for endpoint
1464 * @cdb: pointer to SCSI CDB
1465 * @sense: pointer to SCSI sense buffer
1466 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1467 * @data_length: fabric expected data transfer length
1468 * @task_addr: SAM task attribute
1469 * @data_dir: DMA data direction
1470 * @flags: flags for command submission from target_sc_flags_tables
1471 * @sgl: struct scatterlist memory for unidirectional mapping
1472 * @sgl_count: scatterlist count for unidirectional mapping
1473 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1474 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
1476 * Returns non zero to signal active I/O shutdown failure. All other
1477 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1478 * but still return zero here.
1480 * This may only be called from process context, and also currently
1481 * assumes internal allocation of fabric payload buffer by target-core.
1483 int target_submit_cmd_map_sgls(struct se_cmd
*se_cmd
, struct se_session
*se_sess
,
1484 unsigned char *cdb
, unsigned char *sense
, u32 unpacked_lun
,
1485 u32 data_length
, int task_attr
, int data_dir
, int flags
,
1486 struct scatterlist
*sgl
, u32 sgl_count
,
1487 struct scatterlist
*sgl_bidi
, u32 sgl_bidi_count
)
1489 struct se_portal_group
*se_tpg
;
1492 se_tpg
= se_sess
->se_tpg
;
1494 BUG_ON(se_cmd
->se_tfo
|| se_cmd
->se_sess
);
1495 BUG_ON(in_interrupt());
1497 * Initialize se_cmd for target operation. From this point
1498 * exceptions are handled by sending exception status via
1499 * target_core_fabric_ops->queue_status() callback
1501 transport_init_se_cmd(se_cmd
, se_tpg
->se_tpg_tfo
, se_sess
,
1502 data_length
, data_dir
, task_attr
, sense
);
1503 if (flags
& TARGET_SCF_UNKNOWN_SIZE
)
1504 se_cmd
->unknown_data_length
= 1;
1506 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1507 * se_sess->sess_cmd_list. A second kref_get here is necessary
1508 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1509 * kref_put() to happen during fabric packet acknowledgement.
1511 rc
= target_get_sess_cmd(se_sess
, se_cmd
, (flags
& TARGET_SCF_ACK_KREF
));
1515 * Signal bidirectional data payloads to target-core
1517 if (flags
& TARGET_SCF_BIDI_OP
)
1518 se_cmd
->se_cmd_flags
|= SCF_BIDI
;
1520 * Locate se_lun pointer and attach it to struct se_cmd
1522 if (transport_lookup_cmd_lun(se_cmd
, unpacked_lun
) < 0) {
1523 transport_send_check_condition_and_sense(se_cmd
,
1524 se_cmd
->scsi_sense_reason
, 0);
1525 target_put_sess_cmd(se_sess
, se_cmd
);
1529 rc
= target_setup_cmd_from_cdb(se_cmd
, cdb
);
1531 transport_generic_request_failure(se_cmd
);
1535 * When a non zero sgl_count has been passed perform SGL passthrough
1536 * mapping for pre-allocated fabric memory instead of having target
1537 * core perform an internal SGL allocation..
1539 if (sgl_count
!= 0) {
1543 * A work-around for tcm_loop as some userspace code via
1544 * scsi-generic do not memset their associated read buffers,
1545 * so go ahead and do that here for type non-data CDBs. Also
1546 * note that this is currently guaranteed to be a single SGL
1547 * for this case by target core in target_setup_cmd_from_cdb()
1548 * -> transport_generic_cmd_sequencer().
1550 if (!(se_cmd
->se_cmd_flags
& SCF_SCSI_DATA_CDB
) &&
1551 se_cmd
->data_direction
== DMA_FROM_DEVICE
) {
1552 unsigned char *buf
= NULL
;
1555 buf
= kmap(sg_page(sgl
)) + sgl
->offset
;
1558 memset(buf
, 0, sgl
->length
);
1559 kunmap(sg_page(sgl
));
1563 rc
= transport_generic_map_mem_to_cmd(se_cmd
, sgl
, sgl_count
,
1564 sgl_bidi
, sgl_bidi_count
);
1566 transport_generic_request_failure(se_cmd
);
1571 * Check if we need to delay processing because of ALUA
1572 * Active/NonOptimized primary access state..
1574 core_alua_check_nonop_delay(se_cmd
);
1576 transport_handle_cdb_direct(se_cmd
);
1579 EXPORT_SYMBOL(target_submit_cmd_map_sgls
);
1582 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1584 * @se_cmd: command descriptor to submit
1585 * @se_sess: associated se_sess for endpoint
1586 * @cdb: pointer to SCSI CDB
1587 * @sense: pointer to SCSI sense buffer
1588 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1589 * @data_length: fabric expected data transfer length
1590 * @task_addr: SAM task attribute
1591 * @data_dir: DMA data direction
1592 * @flags: flags for command submission from target_sc_flags_tables
1594 * Returns non zero to signal active I/O shutdown failure. All other
1595 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1596 * but still return zero here.
1598 * This may only be called from process context, and also currently
1599 * assumes internal allocation of fabric payload buffer by target-core.
1601 * It also assumes interal target core SGL memory allocation.
1603 int target_submit_cmd(struct se_cmd
*se_cmd
, struct se_session
*se_sess
,
1604 unsigned char *cdb
, unsigned char *sense
, u32 unpacked_lun
,
1605 u32 data_length
, int task_attr
, int data_dir
, int flags
)
1607 return target_submit_cmd_map_sgls(se_cmd
, se_sess
, cdb
, sense
,
1608 unpacked_lun
, data_length
, task_attr
, data_dir
,
1609 flags
, NULL
, 0, NULL
, 0);
1611 EXPORT_SYMBOL(target_submit_cmd
);
1613 static void target_complete_tmr_failure(struct work_struct
*work
)
1615 struct se_cmd
*se_cmd
= container_of(work
, struct se_cmd
, work
);
1617 se_cmd
->se_tmr_req
->response
= TMR_LUN_DOES_NOT_EXIST
;
1618 se_cmd
->se_tfo
->queue_tm_rsp(se_cmd
);
1622 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1625 * @se_cmd: command descriptor to submit
1626 * @se_sess: associated se_sess for endpoint
1627 * @sense: pointer to SCSI sense buffer
1628 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1629 * @fabric_context: fabric context for TMR req
1630 * @tm_type: Type of TM request
1631 * @gfp: gfp type for caller
1632 * @tag: referenced task tag for TMR_ABORT_TASK
1633 * @flags: submit cmd flags
1635 * Callable from all contexts.
1638 int target_submit_tmr(struct se_cmd
*se_cmd
, struct se_session
*se_sess
,
1639 unsigned char *sense
, u32 unpacked_lun
,
1640 void *fabric_tmr_ptr
, unsigned char tm_type
,
1641 gfp_t gfp
, unsigned int tag
, int flags
)
1643 struct se_portal_group
*se_tpg
;
1646 se_tpg
= se_sess
->se_tpg
;
1649 transport_init_se_cmd(se_cmd
, se_tpg
->se_tpg_tfo
, se_sess
,
1650 0, DMA_NONE
, MSG_SIMPLE_TAG
, sense
);
1652 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1653 * allocation failure.
1655 ret
= core_tmr_alloc_req(se_cmd
, fabric_tmr_ptr
, tm_type
, gfp
);
1659 if (tm_type
== TMR_ABORT_TASK
)
1660 se_cmd
->se_tmr_req
->ref_task_tag
= tag
;
1662 /* See target_submit_cmd for commentary */
1663 ret
= target_get_sess_cmd(se_sess
, se_cmd
, (flags
& TARGET_SCF_ACK_KREF
));
1665 core_tmr_release_req(se_cmd
->se_tmr_req
);
1669 ret
= transport_lookup_tmr_lun(se_cmd
, unpacked_lun
);
1672 * For callback during failure handling, push this work off
1673 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1675 INIT_WORK(&se_cmd
->work
, target_complete_tmr_failure
);
1676 schedule_work(&se_cmd
->work
);
1679 transport_generic_handle_tmr(se_cmd
);
1682 EXPORT_SYMBOL(target_submit_tmr
);
1685 * If the cmd is active, request it to be stopped and sleep until it
1688 bool target_stop_cmd(struct se_cmd
*cmd
, unsigned long *flags
)
1690 bool was_active
= false;
1692 if (cmd
->transport_state
& CMD_T_BUSY
) {
1693 cmd
->transport_state
|= CMD_T_REQUEST_STOP
;
1694 spin_unlock_irqrestore(&cmd
->t_state_lock
, *flags
);
1696 pr_debug("cmd %p waiting to complete\n", cmd
);
1697 wait_for_completion(&cmd
->task_stop_comp
);
1698 pr_debug("cmd %p stopped successfully\n", cmd
);
1700 spin_lock_irqsave(&cmd
->t_state_lock
, *flags
);
1701 cmd
->transport_state
&= ~CMD_T_REQUEST_STOP
;
1702 cmd
->transport_state
&= ~CMD_T_BUSY
;
1710 * Handle SAM-esque emulation for generic transport request failures.
1712 void transport_generic_request_failure(struct se_cmd
*cmd
)
1716 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1717 " CDB: 0x%02x\n", cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
1718 cmd
->t_task_cdb
[0]);
1719 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
1720 cmd
->se_tfo
->get_cmd_state(cmd
),
1721 cmd
->t_state
, cmd
->scsi_sense_reason
);
1722 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1723 (cmd
->transport_state
& CMD_T_ACTIVE
) != 0,
1724 (cmd
->transport_state
& CMD_T_STOP
) != 0,
1725 (cmd
->transport_state
& CMD_T_SENT
) != 0);
1728 * For SAM Task Attribute emulation for failed struct se_cmd
1730 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
1731 transport_complete_task_attr(cmd
);
1733 switch (cmd
->scsi_sense_reason
) {
1734 case TCM_NON_EXISTENT_LUN
:
1735 case TCM_UNSUPPORTED_SCSI_OPCODE
:
1736 case TCM_INVALID_CDB_FIELD
:
1737 case TCM_INVALID_PARAMETER_LIST
:
1738 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
1739 case TCM_UNKNOWN_MODE_PAGE
:
1740 case TCM_WRITE_PROTECTED
:
1741 case TCM_ADDRESS_OUT_OF_RANGE
:
1742 case TCM_CHECK_CONDITION_ABORT_CMD
:
1743 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
1744 case TCM_CHECK_CONDITION_NOT_READY
:
1746 case TCM_RESERVATION_CONFLICT
:
1748 * No SENSE Data payload for this case, set SCSI Status
1749 * and queue the response to $FABRIC_MOD.
1751 * Uses linux/include/scsi/scsi.h SAM status codes defs
1753 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
1755 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1756 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1759 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1762 cmd
->se_dev
->se_sub_dev
->se_dev_attrib
.emulate_ua_intlck_ctrl
== 2)
1763 core_scsi3_ua_allocate(cmd
->se_sess
->se_node_acl
,
1764 cmd
->orig_fe_lun
, 0x2C,
1765 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS
);
1767 ret
= cmd
->se_tfo
->queue_status(cmd
);
1768 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1772 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1773 cmd
->t_task_cdb
[0], cmd
->scsi_sense_reason
);
1774 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
1778 ret
= transport_send_check_condition_and_sense(cmd
,
1779 cmd
->scsi_sense_reason
, 0);
1780 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1784 transport_lun_remove_cmd(cmd
);
1785 if (!transport_cmd_check_stop_to_fabric(cmd
))
1790 cmd
->t_state
= TRANSPORT_COMPLETE_QF_OK
;
1791 transport_handle_queue_full(cmd
, cmd
->se_dev
);
1793 EXPORT_SYMBOL(transport_generic_request_failure
);
1795 static void __target_execute_cmd(struct se_cmd
*cmd
)
1799 spin_lock_irq(&cmd
->t_state_lock
);
1800 cmd
->transport_state
|= (CMD_T_BUSY
|CMD_T_SENT
);
1801 spin_unlock_irq(&cmd
->t_state_lock
);
1803 if (cmd
->execute_cmd
)
1804 error
= cmd
->execute_cmd(cmd
);
1807 spin_lock_irq(&cmd
->t_state_lock
);
1808 cmd
->transport_state
&= ~(CMD_T_BUSY
|CMD_T_SENT
);
1809 spin_unlock_irq(&cmd
->t_state_lock
);
1811 transport_generic_request_failure(cmd
);
1815 void target_execute_cmd(struct se_cmd
*cmd
)
1817 struct se_device
*dev
= cmd
->se_dev
;
1820 * If the received CDB has aleady been aborted stop processing it here.
1822 if (transport_check_aborted_status(cmd
, 1))
1826 * Determine if IOCTL context caller in requesting the stopping of this
1827 * command for LUN shutdown purposes.
1829 spin_lock_irq(&cmd
->t_state_lock
);
1830 if (cmd
->transport_state
& CMD_T_LUN_STOP
) {
1831 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
1832 __func__
, __LINE__
, cmd
->se_tfo
->get_task_tag(cmd
));
1834 cmd
->transport_state
&= ~CMD_T_ACTIVE
;
1835 spin_unlock_irq(&cmd
->t_state_lock
);
1836 complete(&cmd
->transport_lun_stop_comp
);
1840 * Determine if frontend context caller is requesting the stopping of
1841 * this command for frontend exceptions.
1843 if (cmd
->transport_state
& CMD_T_STOP
) {
1844 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1846 cmd
->se_tfo
->get_task_tag(cmd
));
1848 spin_unlock_irq(&cmd
->t_state_lock
);
1849 complete(&cmd
->t_transport_stop_comp
);
1853 cmd
->t_state
= TRANSPORT_PROCESSING
;
1854 spin_unlock_irq(&cmd
->t_state_lock
);
1856 if (dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
1860 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1861 * to allow the passed struct se_cmd list of tasks to the front of the list.
1863 switch (cmd
->sam_task_attr
) {
1865 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1866 "se_ordered_id: %u\n",
1867 cmd
->t_task_cdb
[0], cmd
->se_ordered_id
);
1869 case MSG_ORDERED_TAG
:
1870 atomic_inc(&dev
->dev_ordered_sync
);
1871 smp_mb__after_atomic_inc();
1873 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1874 " se_ordered_id: %u\n",
1875 cmd
->t_task_cdb
[0], cmd
->se_ordered_id
);
1878 * Execute an ORDERED command if no other older commands
1879 * exist that need to be completed first.
1881 if (!atomic_read(&dev
->simple_cmds
))
1886 * For SIMPLE and UNTAGGED Task Attribute commands
1888 atomic_inc(&dev
->simple_cmds
);
1889 smp_mb__after_atomic_inc();
1893 if (atomic_read(&dev
->dev_ordered_sync
) != 0) {
1894 spin_lock(&dev
->delayed_cmd_lock
);
1895 list_add_tail(&cmd
->se_delayed_node
, &dev
->delayed_cmd_list
);
1896 spin_unlock(&dev
->delayed_cmd_lock
);
1898 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1899 " delayed CMD list, se_ordered_id: %u\n",
1900 cmd
->t_task_cdb
[0], cmd
->sam_task_attr
,
1901 cmd
->se_ordered_id
);
1907 * Otherwise, no ORDERED task attributes exist..
1909 __target_execute_cmd(cmd
);
1911 EXPORT_SYMBOL(target_execute_cmd
);
1914 * Process all commands up to the last received ORDERED task attribute which
1915 * requires another blocking boundary
1917 static void target_restart_delayed_cmds(struct se_device
*dev
)
1922 spin_lock(&dev
->delayed_cmd_lock
);
1923 if (list_empty(&dev
->delayed_cmd_list
)) {
1924 spin_unlock(&dev
->delayed_cmd_lock
);
1928 cmd
= list_entry(dev
->delayed_cmd_list
.next
,
1929 struct se_cmd
, se_delayed_node
);
1930 list_del(&cmd
->se_delayed_node
);
1931 spin_unlock(&dev
->delayed_cmd_lock
);
1933 __target_execute_cmd(cmd
);
1935 if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
)
1941 * Called from I/O completion to determine which dormant/delayed
1942 * and ordered cmds need to have their tasks added to the execution queue.
1944 static void transport_complete_task_attr(struct se_cmd
*cmd
)
1946 struct se_device
*dev
= cmd
->se_dev
;
1948 if (cmd
->sam_task_attr
== MSG_SIMPLE_TAG
) {
1949 atomic_dec(&dev
->simple_cmds
);
1950 smp_mb__after_atomic_dec();
1951 dev
->dev_cur_ordered_id
++;
1952 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
1953 " SIMPLE: %u\n", dev
->dev_cur_ordered_id
,
1954 cmd
->se_ordered_id
);
1955 } else if (cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
1956 dev
->dev_cur_ordered_id
++;
1957 pr_debug("Incremented dev_cur_ordered_id: %u for"
1958 " HEAD_OF_QUEUE: %u\n", dev
->dev_cur_ordered_id
,
1959 cmd
->se_ordered_id
);
1960 } else if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
) {
1961 atomic_dec(&dev
->dev_ordered_sync
);
1962 smp_mb__after_atomic_dec();
1964 dev
->dev_cur_ordered_id
++;
1965 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
1966 " %u\n", dev
->dev_cur_ordered_id
, cmd
->se_ordered_id
);
1969 target_restart_delayed_cmds(dev
);
1972 static void transport_complete_qf(struct se_cmd
*cmd
)
1976 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
1977 transport_complete_task_attr(cmd
);
1979 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
1980 ret
= cmd
->se_tfo
->queue_status(cmd
);
1985 switch (cmd
->data_direction
) {
1986 case DMA_FROM_DEVICE
:
1987 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
1990 if (cmd
->t_bidi_data_sg
) {
1991 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
1995 /* Fall through for DMA_TO_DEVICE */
1997 ret
= cmd
->se_tfo
->queue_status(cmd
);
2005 transport_handle_queue_full(cmd
, cmd
->se_dev
);
2008 transport_lun_remove_cmd(cmd
);
2009 transport_cmd_check_stop_to_fabric(cmd
);
2012 static void transport_handle_queue_full(
2014 struct se_device
*dev
)
2016 spin_lock_irq(&dev
->qf_cmd_lock
);
2017 list_add_tail(&cmd
->se_qf_node
, &cmd
->se_dev
->qf_cmd_list
);
2018 atomic_inc(&dev
->dev_qf_count
);
2019 smp_mb__after_atomic_inc();
2020 spin_unlock_irq(&cmd
->se_dev
->qf_cmd_lock
);
2022 schedule_work(&cmd
->se_dev
->qf_work_queue
);
2025 static void target_complete_ok_work(struct work_struct
*work
)
2027 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
2031 * Check if we need to move delayed/dormant tasks from cmds on the
2032 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
2035 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
2036 transport_complete_task_attr(cmd
);
2038 * Check to schedule QUEUE_FULL work, or execute an existing
2039 * cmd->transport_qf_callback()
2041 if (atomic_read(&cmd
->se_dev
->dev_qf_count
) != 0)
2042 schedule_work(&cmd
->se_dev
->qf_work_queue
);
2045 * Check if we need to send a sense buffer from
2046 * the struct se_cmd in question.
2048 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
2049 WARN_ON(!cmd
->scsi_status
);
2050 ret
= transport_send_check_condition_and_sense(
2052 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
2055 transport_lun_remove_cmd(cmd
);
2056 transport_cmd_check_stop_to_fabric(cmd
);
2060 * Check for a callback, used by amongst other things
2061 * XDWRITE_READ_10 emulation.
2063 if (cmd
->transport_complete_callback
)
2064 cmd
->transport_complete_callback(cmd
);
2066 switch (cmd
->data_direction
) {
2067 case DMA_FROM_DEVICE
:
2068 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
2069 if (cmd
->se_lun
->lun_sep
) {
2070 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
2073 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
2075 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
2076 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
2080 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
2081 if (cmd
->se_lun
->lun_sep
) {
2082 cmd
->se_lun
->lun_sep
->sep_stats
.rx_data_octets
+=
2085 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
2087 * Check if we need to send READ payload for BIDI-COMMAND
2089 if (cmd
->t_bidi_data_sg
) {
2090 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
2091 if (cmd
->se_lun
->lun_sep
) {
2092 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
2095 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
2096 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
2097 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
2101 /* Fall through for DMA_TO_DEVICE */
2103 ret
= cmd
->se_tfo
->queue_status(cmd
);
2104 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
2111 transport_lun_remove_cmd(cmd
);
2112 transport_cmd_check_stop_to_fabric(cmd
);
2116 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
2117 " data_direction: %d\n", cmd
, cmd
->data_direction
);
2118 cmd
->t_state
= TRANSPORT_COMPLETE_QF_OK
;
2119 transport_handle_queue_full(cmd
, cmd
->se_dev
);
2122 static inline void transport_free_sgl(struct scatterlist
*sgl
, int nents
)
2124 struct scatterlist
*sg
;
2127 for_each_sg(sgl
, sg
, nents
, count
)
2128 __free_page(sg_page(sg
));
2133 static inline void transport_free_pages(struct se_cmd
*cmd
)
2135 if (cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
)
2138 transport_free_sgl(cmd
->t_data_sg
, cmd
->t_data_nents
);
2139 cmd
->t_data_sg
= NULL
;
2140 cmd
->t_data_nents
= 0;
2142 transport_free_sgl(cmd
->t_bidi_data_sg
, cmd
->t_bidi_data_nents
);
2143 cmd
->t_bidi_data_sg
= NULL
;
2144 cmd
->t_bidi_data_nents
= 0;
2148 * transport_release_cmd - free a command
2149 * @cmd: command to free
2151 * This routine unconditionally frees a command, and reference counting
2152 * or list removal must be done in the caller.
2154 static void transport_release_cmd(struct se_cmd
*cmd
)
2156 BUG_ON(!cmd
->se_tfo
);
2158 if (cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
)
2159 core_tmr_release_req(cmd
->se_tmr_req
);
2160 if (cmd
->t_task_cdb
!= cmd
->__t_task_cdb
)
2161 kfree(cmd
->t_task_cdb
);
2163 * If this cmd has been setup with target_get_sess_cmd(), drop
2164 * the kref and call ->release_cmd() in kref callback.
2166 if (cmd
->check_release
!= 0) {
2167 target_put_sess_cmd(cmd
->se_sess
, cmd
);
2170 cmd
->se_tfo
->release_cmd(cmd
);
2174 * transport_put_cmd - release a reference to a command
2175 * @cmd: command to release
2177 * This routine releases our reference to the command and frees it if possible.
2179 static void transport_put_cmd(struct se_cmd
*cmd
)
2181 unsigned long flags
;
2183 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2184 if (atomic_read(&cmd
->t_fe_count
)) {
2185 if (!atomic_dec_and_test(&cmd
->t_fe_count
))
2189 if (cmd
->transport_state
& CMD_T_DEV_ACTIVE
) {
2190 cmd
->transport_state
&= ~CMD_T_DEV_ACTIVE
;
2191 target_remove_from_state_list(cmd
);
2193 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2195 transport_free_pages(cmd
);
2196 transport_release_cmd(cmd
);
2199 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2203 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
2204 * allocating in the core.
2205 * @cmd: Associated se_cmd descriptor
2206 * @mem: SGL style memory for TCM WRITE / READ
2207 * @sg_mem_num: Number of SGL elements
2208 * @mem_bidi_in: SGL style memory for TCM BIDI READ
2209 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
2211 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
2214 int transport_generic_map_mem_to_cmd(
2216 struct scatterlist
*sgl
,
2218 struct scatterlist
*sgl_bidi
,
2221 if (!sgl
|| !sgl_count
)
2225 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
2226 * scatterlists already have been set to follow what the fabric
2227 * passes for the original expected data transfer length.
2229 if (cmd
->se_cmd_flags
& SCF_OVERFLOW_BIT
) {
2230 pr_warn("Rejecting SCSI DATA overflow for fabric using"
2231 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
2232 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2233 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
2237 cmd
->t_data_sg
= sgl
;
2238 cmd
->t_data_nents
= sgl_count
;
2240 if (sgl_bidi
&& sgl_bidi_count
) {
2241 cmd
->t_bidi_data_sg
= sgl_bidi
;
2242 cmd
->t_bidi_data_nents
= sgl_bidi_count
;
2244 cmd
->se_cmd_flags
|= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
;
2247 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd
);
2249 void *transport_kmap_data_sg(struct se_cmd
*cmd
)
2251 struct scatterlist
*sg
= cmd
->t_data_sg
;
2252 struct page
**pages
;
2256 * We need to take into account a possible offset here for fabrics like
2257 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2258 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
2260 if (!cmd
->t_data_nents
)
2264 if (cmd
->t_data_nents
== 1)
2265 return kmap(sg_page(sg
)) + sg
->offset
;
2267 /* >1 page. use vmap */
2268 pages
= kmalloc(sizeof(*pages
) * cmd
->t_data_nents
, GFP_KERNEL
);
2270 cmd
->scsi_sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2274 /* convert sg[] to pages[] */
2275 for_each_sg(cmd
->t_data_sg
, sg
, cmd
->t_data_nents
, i
) {
2276 pages
[i
] = sg_page(sg
);
2279 cmd
->t_data_vmap
= vmap(pages
, cmd
->t_data_nents
, VM_MAP
, PAGE_KERNEL
);
2281 if (!cmd
->t_data_vmap
) {
2282 cmd
->scsi_sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2286 return cmd
->t_data_vmap
+ cmd
->t_data_sg
[0].offset
;
2288 EXPORT_SYMBOL(transport_kmap_data_sg
);
2290 void transport_kunmap_data_sg(struct se_cmd
*cmd
)
2292 if (!cmd
->t_data_nents
) {
2294 } else if (cmd
->t_data_nents
== 1) {
2295 kunmap(sg_page(cmd
->t_data_sg
));
2299 vunmap(cmd
->t_data_vmap
);
2300 cmd
->t_data_vmap
= NULL
;
2302 EXPORT_SYMBOL(transport_kunmap_data_sg
);
2305 transport_generic_get_mem(struct se_cmd
*cmd
)
2307 u32 length
= cmd
->data_length
;
2313 nents
= DIV_ROUND_UP(length
, PAGE_SIZE
);
2314 cmd
->t_data_sg
= kmalloc(sizeof(struct scatterlist
) * nents
, GFP_KERNEL
);
2315 if (!cmd
->t_data_sg
)
2318 cmd
->t_data_nents
= nents
;
2319 sg_init_table(cmd
->t_data_sg
, nents
);
2321 zero_flag
= cmd
->se_cmd_flags
& SCF_SCSI_DATA_CDB
? 0 : __GFP_ZERO
;
2324 u32 page_len
= min_t(u32
, length
, PAGE_SIZE
);
2325 page
= alloc_page(GFP_KERNEL
| zero_flag
);
2329 sg_set_page(&cmd
->t_data_sg
[i
], page
, page_len
, 0);
2338 __free_page(sg_page(&cmd
->t_data_sg
[i
]));
2340 kfree(cmd
->t_data_sg
);
2341 cmd
->t_data_sg
= NULL
;
2346 * Allocate any required resources to execute the command. For writes we
2347 * might not have the payload yet, so notify the fabric via a call to
2348 * ->write_pending instead. Otherwise place it on the execution queue.
2350 int transport_generic_new_cmd(struct se_cmd
*cmd
)
2355 * Determine is the TCM fabric module has already allocated physical
2356 * memory, and is directly calling transport_generic_map_mem_to_cmd()
2359 if (!(cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
) &&
2361 ret
= transport_generic_get_mem(cmd
);
2366 atomic_inc(&cmd
->t_fe_count
);
2369 * If this command is not a write we can execute it right here,
2370 * for write buffers we need to notify the fabric driver first
2371 * and let it call back once the write buffers are ready.
2373 target_add_to_state_list(cmd
);
2374 if (cmd
->data_direction
!= DMA_TO_DEVICE
) {
2375 target_execute_cmd(cmd
);
2379 spin_lock_irq(&cmd
->t_state_lock
);
2380 cmd
->t_state
= TRANSPORT_WRITE_PENDING
;
2381 spin_unlock_irq(&cmd
->t_state_lock
);
2383 transport_cmd_check_stop(cmd
, false);
2385 ret
= cmd
->se_tfo
->write_pending(cmd
);
2386 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
2394 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2395 cmd
->scsi_sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2398 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd
);
2399 cmd
->t_state
= TRANSPORT_COMPLETE_QF_WP
;
2400 transport_handle_queue_full(cmd
, cmd
->se_dev
);
2403 EXPORT_SYMBOL(transport_generic_new_cmd
);
2405 static void transport_write_pending_qf(struct se_cmd
*cmd
)
2409 ret
= cmd
->se_tfo
->write_pending(cmd
);
2410 if (ret
== -EAGAIN
|| ret
== -ENOMEM
) {
2411 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2413 transport_handle_queue_full(cmd
, cmd
->se_dev
);
2417 void transport_generic_free_cmd(struct se_cmd
*cmd
, int wait_for_tasks
)
2419 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
)) {
2420 if (wait_for_tasks
&& (cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
))
2421 transport_wait_for_tasks(cmd
);
2423 transport_release_cmd(cmd
);
2426 transport_wait_for_tasks(cmd
);
2428 core_dec_lacl_count(cmd
->se_sess
->se_node_acl
, cmd
);
2431 transport_lun_remove_cmd(cmd
);
2433 transport_put_cmd(cmd
);
2436 EXPORT_SYMBOL(transport_generic_free_cmd
);
2438 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
2439 * @se_sess: session to reference
2440 * @se_cmd: command descriptor to add
2441 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
2443 static int target_get_sess_cmd(struct se_session
*se_sess
, struct se_cmd
*se_cmd
,
2446 unsigned long flags
;
2449 kref_init(&se_cmd
->cmd_kref
);
2451 * Add a second kref if the fabric caller is expecting to handle
2452 * fabric acknowledgement that requires two target_put_sess_cmd()
2453 * invocations before se_cmd descriptor release.
2455 if (ack_kref
== true) {
2456 kref_get(&se_cmd
->cmd_kref
);
2457 se_cmd
->se_cmd_flags
|= SCF_ACK_KREF
;
2460 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
2461 if (se_sess
->sess_tearing_down
) {
2465 list_add_tail(&se_cmd
->se_cmd_list
, &se_sess
->sess_cmd_list
);
2466 se_cmd
->check_release
= 1;
2469 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
2473 static void target_release_cmd_kref(struct kref
*kref
)
2475 struct se_cmd
*se_cmd
= container_of(kref
, struct se_cmd
, cmd_kref
);
2476 struct se_session
*se_sess
= se_cmd
->se_sess
;
2477 unsigned long flags
;
2479 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
2480 if (list_empty(&se_cmd
->se_cmd_list
)) {
2481 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
2482 se_cmd
->se_tfo
->release_cmd(se_cmd
);
2485 if (se_sess
->sess_tearing_down
&& se_cmd
->cmd_wait_set
) {
2486 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
2487 complete(&se_cmd
->cmd_wait_comp
);
2490 list_del(&se_cmd
->se_cmd_list
);
2491 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
2493 se_cmd
->se_tfo
->release_cmd(se_cmd
);
2496 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2497 * @se_sess: session to reference
2498 * @se_cmd: command descriptor to drop
2500 int target_put_sess_cmd(struct se_session
*se_sess
, struct se_cmd
*se_cmd
)
2502 return kref_put(&se_cmd
->cmd_kref
, target_release_cmd_kref
);
2504 EXPORT_SYMBOL(target_put_sess_cmd
);
2506 /* target_sess_cmd_list_set_waiting - Flag all commands in
2507 * sess_cmd_list to complete cmd_wait_comp. Set
2508 * sess_tearing_down so no more commands are queued.
2509 * @se_sess: session to flag
2511 void target_sess_cmd_list_set_waiting(struct se_session
*se_sess
)
2513 struct se_cmd
*se_cmd
;
2514 unsigned long flags
;
2516 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
2518 WARN_ON(se_sess
->sess_tearing_down
);
2519 se_sess
->sess_tearing_down
= 1;
2521 list_for_each_entry(se_cmd
, &se_sess
->sess_cmd_list
, se_cmd_list
)
2522 se_cmd
->cmd_wait_set
= 1;
2524 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
2526 EXPORT_SYMBOL(target_sess_cmd_list_set_waiting
);
2528 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
2529 * @se_sess: session to wait for active I/O
2530 * @wait_for_tasks: Make extra transport_wait_for_tasks call
2532 void target_wait_for_sess_cmds(
2533 struct se_session
*se_sess
,
2536 struct se_cmd
*se_cmd
, *tmp_cmd
;
2539 list_for_each_entry_safe(se_cmd
, tmp_cmd
,
2540 &se_sess
->sess_cmd_list
, se_cmd_list
) {
2541 list_del(&se_cmd
->se_cmd_list
);
2543 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2544 " %d\n", se_cmd
, se_cmd
->t_state
,
2545 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
2547 if (wait_for_tasks
) {
2548 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
2549 " fabric state: %d\n", se_cmd
, se_cmd
->t_state
,
2550 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
2552 rc
= transport_wait_for_tasks(se_cmd
);
2554 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
2555 " fabric state: %d\n", se_cmd
, se_cmd
->t_state
,
2556 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
2560 wait_for_completion(&se_cmd
->cmd_wait_comp
);
2561 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2562 " fabric state: %d\n", se_cmd
, se_cmd
->t_state
,
2563 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
2566 se_cmd
->se_tfo
->release_cmd(se_cmd
);
2569 EXPORT_SYMBOL(target_wait_for_sess_cmds
);
2571 /* transport_lun_wait_for_tasks():
2573 * Called from ConfigFS context to stop the passed struct se_cmd to allow
2574 * an struct se_lun to be successfully shutdown.
2576 static int transport_lun_wait_for_tasks(struct se_cmd
*cmd
, struct se_lun
*lun
)
2578 unsigned long flags
;
2582 * If the frontend has already requested this struct se_cmd to
2583 * be stopped, we can safely ignore this struct se_cmd.
2585 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2586 if (cmd
->transport_state
& CMD_T_STOP
) {
2587 cmd
->transport_state
&= ~CMD_T_LUN_STOP
;
2589 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
2590 cmd
->se_tfo
->get_task_tag(cmd
));
2591 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2592 transport_cmd_check_stop(cmd
, false);
2595 cmd
->transport_state
|= CMD_T_LUN_FE_STOP
;
2596 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2598 // XXX: audit task_flags checks.
2599 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2600 if ((cmd
->transport_state
& CMD_T_BUSY
) &&
2601 (cmd
->transport_state
& CMD_T_SENT
)) {
2602 if (!target_stop_cmd(cmd
, &flags
))
2605 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2607 pr_debug("ConfigFS: cmd: %p stop tasks ret:"
2610 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
2611 cmd
->se_tfo
->get_task_tag(cmd
));
2612 wait_for_completion(&cmd
->transport_lun_stop_comp
);
2613 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
2614 cmd
->se_tfo
->get_task_tag(cmd
));
2620 static void __transport_clear_lun_from_sessions(struct se_lun
*lun
)
2622 struct se_cmd
*cmd
= NULL
;
2623 unsigned long lun_flags
, cmd_flags
;
2625 * Do exception processing and return CHECK_CONDITION status to the
2628 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
2629 while (!list_empty(&lun
->lun_cmd_list
)) {
2630 cmd
= list_first_entry(&lun
->lun_cmd_list
,
2631 struct se_cmd
, se_lun_node
);
2632 list_del_init(&cmd
->se_lun_node
);
2634 spin_lock(&cmd
->t_state_lock
);
2635 pr_debug("SE_LUN[%d] - Setting cmd->transport"
2636 "_lun_stop for ITT: 0x%08x\n",
2637 cmd
->se_lun
->unpacked_lun
,
2638 cmd
->se_tfo
->get_task_tag(cmd
));
2639 cmd
->transport_state
|= CMD_T_LUN_STOP
;
2640 spin_unlock(&cmd
->t_state_lock
);
2642 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
2645 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
2646 cmd
->se_tfo
->get_task_tag(cmd
),
2647 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
);
2651 * If the Storage engine still owns the iscsi_cmd_t, determine
2652 * and/or stop its context.
2654 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
2655 "_lun_wait_for_tasks()\n", cmd
->se_lun
->unpacked_lun
,
2656 cmd
->se_tfo
->get_task_tag(cmd
));
2658 if (transport_lun_wait_for_tasks(cmd
, cmd
->se_lun
) < 0) {
2659 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
2663 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
2664 "_wait_for_tasks(): SUCCESS\n",
2665 cmd
->se_lun
->unpacked_lun
,
2666 cmd
->se_tfo
->get_task_tag(cmd
));
2668 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
2669 if (!(cmd
->transport_state
& CMD_T_DEV_ACTIVE
)) {
2670 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
2673 cmd
->transport_state
&= ~CMD_T_DEV_ACTIVE
;
2674 target_remove_from_state_list(cmd
);
2675 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
2678 * The Storage engine stopped this struct se_cmd before it was
2679 * send to the fabric frontend for delivery back to the
2680 * Initiator Node. Return this SCSI CDB back with an
2681 * CHECK_CONDITION status.
2684 transport_send_check_condition_and_sense(cmd
,
2685 TCM_NON_EXISTENT_LUN
, 0);
2687 * If the fabric frontend is waiting for this iscsi_cmd_t to
2688 * be released, notify the waiting thread now that LU has
2689 * finished accessing it.
2691 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
2692 if (cmd
->transport_state
& CMD_T_LUN_FE_STOP
) {
2693 pr_debug("SE_LUN[%d] - Detected FE stop for"
2694 " struct se_cmd: %p ITT: 0x%08x\n",
2696 cmd
, cmd
->se_tfo
->get_task_tag(cmd
));
2698 spin_unlock_irqrestore(&cmd
->t_state_lock
,
2700 transport_cmd_check_stop(cmd
, false);
2701 complete(&cmd
->transport_lun_fe_stop_comp
);
2702 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
2705 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
2706 lun
->unpacked_lun
, cmd
->se_tfo
->get_task_tag(cmd
));
2708 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
2709 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
2711 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
2714 static int transport_clear_lun_thread(void *p
)
2716 struct se_lun
*lun
= p
;
2718 __transport_clear_lun_from_sessions(lun
);
2719 complete(&lun
->lun_shutdown_comp
);
2724 int transport_clear_lun_from_sessions(struct se_lun
*lun
)
2726 struct task_struct
*kt
;
2728 kt
= kthread_run(transport_clear_lun_thread
, lun
,
2729 "tcm_cl_%u", lun
->unpacked_lun
);
2731 pr_err("Unable to start clear_lun thread\n");
2734 wait_for_completion(&lun
->lun_shutdown_comp
);
2740 * transport_wait_for_tasks - wait for completion to occur
2741 * @cmd: command to wait
2743 * Called from frontend fabric context to wait for storage engine
2744 * to pause and/or release frontend generated struct se_cmd.
2746 bool transport_wait_for_tasks(struct se_cmd
*cmd
)
2748 unsigned long flags
;
2750 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2751 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
) &&
2752 !(cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
)) {
2753 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2757 if (!(cmd
->se_cmd_flags
& SCF_SUPPORTED_SAM_OPCODE
) &&
2758 !(cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
)) {
2759 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2763 * If we are already stopped due to an external event (ie: LUN shutdown)
2764 * sleep until the connection can have the passed struct se_cmd back.
2765 * The cmd->transport_lun_stopped_sem will be upped by
2766 * transport_clear_lun_from_sessions() once the ConfigFS context caller
2767 * has completed its operation on the struct se_cmd.
2769 if (cmd
->transport_state
& CMD_T_LUN_STOP
) {
2770 pr_debug("wait_for_tasks: Stopping"
2771 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
2772 "_stop_comp); for ITT: 0x%08x\n",
2773 cmd
->se_tfo
->get_task_tag(cmd
));
2775 * There is a special case for WRITES where a FE exception +
2776 * LUN shutdown means ConfigFS context is still sleeping on
2777 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
2778 * We go ahead and up transport_lun_stop_comp just to be sure
2781 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2782 complete(&cmd
->transport_lun_stop_comp
);
2783 wait_for_completion(&cmd
->transport_lun_fe_stop_comp
);
2784 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2786 target_remove_from_state_list(cmd
);
2788 * At this point, the frontend who was the originator of this
2789 * struct se_cmd, now owns the structure and can be released through
2790 * normal means below.
2792 pr_debug("wait_for_tasks: Stopped"
2793 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
2794 "stop_comp); for ITT: 0x%08x\n",
2795 cmd
->se_tfo
->get_task_tag(cmd
));
2797 cmd
->transport_state
&= ~CMD_T_LUN_STOP
;
2800 if (!(cmd
->transport_state
& CMD_T_ACTIVE
)) {
2801 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2805 cmd
->transport_state
|= CMD_T_STOP
;
2807 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
2808 " i_state: %d, t_state: %d, CMD_T_STOP\n",
2809 cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
2810 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
);
2812 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2814 wait_for_completion(&cmd
->t_transport_stop_comp
);
2816 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2817 cmd
->transport_state
&= ~(CMD_T_ACTIVE
| CMD_T_STOP
);
2819 pr_debug("wait_for_tasks: Stopped wait_for_completion("
2820 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
2821 cmd
->se_tfo
->get_task_tag(cmd
));
2823 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2827 EXPORT_SYMBOL(transport_wait_for_tasks
);
2829 static int transport_get_sense_codes(
2834 *asc
= cmd
->scsi_asc
;
2835 *ascq
= cmd
->scsi_ascq
;
2840 static int transport_set_sense_codes(
2845 cmd
->scsi_asc
= asc
;
2846 cmd
->scsi_ascq
= ascq
;
2851 int transport_send_check_condition_and_sense(
2856 unsigned char *buffer
= cmd
->sense_buffer
;
2857 unsigned long flags
;
2858 u8 asc
= 0, ascq
= 0;
2860 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2861 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
2862 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2865 cmd
->se_cmd_flags
|= SCF_SENT_CHECK_CONDITION
;
2866 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2868 if (!reason
&& from_transport
)
2871 if (!from_transport
)
2872 cmd
->se_cmd_flags
|= SCF_EMULATED_TASK_SENSE
;
2875 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2876 * SENSE KEY values from include/scsi/scsi.h
2879 case TCM_NON_EXISTENT_LUN
:
2882 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2883 /* ILLEGAL REQUEST */
2884 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2885 /* LOGICAL UNIT NOT SUPPORTED */
2886 buffer
[SPC_ASC_KEY_OFFSET
] = 0x25;
2888 case TCM_UNSUPPORTED_SCSI_OPCODE
:
2889 case TCM_SECTOR_COUNT_TOO_MANY
:
2892 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2893 /* ILLEGAL REQUEST */
2894 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2895 /* INVALID COMMAND OPERATION CODE */
2896 buffer
[SPC_ASC_KEY_OFFSET
] = 0x20;
2898 case TCM_UNKNOWN_MODE_PAGE
:
2901 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2902 /* ILLEGAL REQUEST */
2903 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2904 /* INVALID FIELD IN CDB */
2905 buffer
[SPC_ASC_KEY_OFFSET
] = 0x24;
2907 case TCM_CHECK_CONDITION_ABORT_CMD
:
2910 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2911 /* ABORTED COMMAND */
2912 buffer
[SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2913 /* BUS DEVICE RESET FUNCTION OCCURRED */
2914 buffer
[SPC_ASC_KEY_OFFSET
] = 0x29;
2915 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x03;
2917 case TCM_INCORRECT_AMOUNT_OF_DATA
:
2920 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2921 /* ABORTED COMMAND */
2922 buffer
[SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2924 buffer
[SPC_ASC_KEY_OFFSET
] = 0x0c;
2925 /* NOT ENOUGH UNSOLICITED DATA */
2926 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x0d;
2928 case TCM_INVALID_CDB_FIELD
:
2931 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2932 /* ILLEGAL REQUEST */
2933 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2934 /* INVALID FIELD IN CDB */
2935 buffer
[SPC_ASC_KEY_OFFSET
] = 0x24;
2937 case TCM_INVALID_PARAMETER_LIST
:
2940 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2941 /* ILLEGAL REQUEST */
2942 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2943 /* INVALID FIELD IN PARAMETER LIST */
2944 buffer
[SPC_ASC_KEY_OFFSET
] = 0x26;
2946 case TCM_UNEXPECTED_UNSOLICITED_DATA
:
2949 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2950 /* ABORTED COMMAND */
2951 buffer
[SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2953 buffer
[SPC_ASC_KEY_OFFSET
] = 0x0c;
2954 /* UNEXPECTED_UNSOLICITED_DATA */
2955 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x0c;
2957 case TCM_SERVICE_CRC_ERROR
:
2960 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2961 /* ABORTED COMMAND */
2962 buffer
[SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2963 /* PROTOCOL SERVICE CRC ERROR */
2964 buffer
[SPC_ASC_KEY_OFFSET
] = 0x47;
2966 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x05;
2968 case TCM_SNACK_REJECTED
:
2971 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2972 /* ABORTED COMMAND */
2973 buffer
[SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2975 buffer
[SPC_ASC_KEY_OFFSET
] = 0x11;
2976 /* FAILED RETRANSMISSION REQUEST */
2977 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x13;
2979 case TCM_WRITE_PROTECTED
:
2982 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2984 buffer
[SPC_SENSE_KEY_OFFSET
] = DATA_PROTECT
;
2985 /* WRITE PROTECTED */
2986 buffer
[SPC_ASC_KEY_OFFSET
] = 0x27;
2988 case TCM_ADDRESS_OUT_OF_RANGE
:
2991 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2992 /* ILLEGAL REQUEST */
2993 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2994 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2995 buffer
[SPC_ASC_KEY_OFFSET
] = 0x21;
2997 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
3000 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
3001 /* UNIT ATTENTION */
3002 buffer
[SPC_SENSE_KEY_OFFSET
] = UNIT_ATTENTION
;
3003 core_scsi3_ua_for_check_condition(cmd
, &asc
, &ascq
);
3004 buffer
[SPC_ASC_KEY_OFFSET
] = asc
;
3005 buffer
[SPC_ASCQ_KEY_OFFSET
] = ascq
;
3007 case TCM_CHECK_CONDITION_NOT_READY
:
3010 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
3012 buffer
[SPC_SENSE_KEY_OFFSET
] = NOT_READY
;
3013 transport_get_sense_codes(cmd
, &asc
, &ascq
);
3014 buffer
[SPC_ASC_KEY_OFFSET
] = asc
;
3015 buffer
[SPC_ASCQ_KEY_OFFSET
] = ascq
;
3017 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
3021 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
3022 /* ILLEGAL REQUEST */
3023 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
3024 /* LOGICAL UNIT COMMUNICATION FAILURE */
3025 buffer
[SPC_ASC_KEY_OFFSET
] = 0x80;
3029 * This code uses linux/include/scsi/scsi.h SAM status codes!
3031 cmd
->scsi_status
= SAM_STAT_CHECK_CONDITION
;
3033 * Automatically padded, this value is encoded in the fabric's
3034 * data_length response PDU containing the SCSI defined sense data.
3036 cmd
->scsi_sense_length
= TRANSPORT_SENSE_BUFFER
;
3039 return cmd
->se_tfo
->queue_status(cmd
);
3041 EXPORT_SYMBOL(transport_send_check_condition_and_sense
);
3043 int transport_check_aborted_status(struct se_cmd
*cmd
, int send_status
)
3047 if (cmd
->transport_state
& CMD_T_ABORTED
) {
3049 (cmd
->se_cmd_flags
& SCF_SENT_DELAYED_TAS
))
3052 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
3053 " status for CDB: 0x%02x ITT: 0x%08x\n",
3055 cmd
->se_tfo
->get_task_tag(cmd
));
3057 cmd
->se_cmd_flags
|= SCF_SENT_DELAYED_TAS
;
3058 cmd
->se_tfo
->queue_status(cmd
);
3063 EXPORT_SYMBOL(transport_check_aborted_status
);
3065 void transport_send_task_abort(struct se_cmd
*cmd
)
3067 unsigned long flags
;
3069 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3070 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
3071 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3074 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3077 * If there are still expected incoming fabric WRITEs, we wait
3078 * until until they have completed before sending a TASK_ABORTED
3079 * response. This response with TASK_ABORTED status will be
3080 * queued back to fabric module by transport_check_aborted_status().
3082 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
3083 if (cmd
->se_tfo
->write_pending_status(cmd
) != 0) {
3084 cmd
->transport_state
|= CMD_T_ABORTED
;
3085 smp_mb__after_atomic_inc();
3088 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
3090 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
3091 " ITT: 0x%08x\n", cmd
->t_task_cdb
[0],
3092 cmd
->se_tfo
->get_task_tag(cmd
));
3094 cmd
->se_tfo
->queue_status(cmd
);
3097 static void target_tmr_work(struct work_struct
*work
)
3099 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
3100 struct se_device
*dev
= cmd
->se_dev
;
3101 struct se_tmr_req
*tmr
= cmd
->se_tmr_req
;
3104 switch (tmr
->function
) {
3105 case TMR_ABORT_TASK
:
3106 core_tmr_abort_task(dev
, tmr
, cmd
->se_sess
);
3108 case TMR_ABORT_TASK_SET
:
3110 case TMR_CLEAR_TASK_SET
:
3111 tmr
->response
= TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED
;
3114 ret
= core_tmr_lun_reset(dev
, tmr
, NULL
, NULL
);
3115 tmr
->response
= (!ret
) ? TMR_FUNCTION_COMPLETE
:
3116 TMR_FUNCTION_REJECTED
;
3118 case TMR_TARGET_WARM_RESET
:
3119 tmr
->response
= TMR_FUNCTION_REJECTED
;
3121 case TMR_TARGET_COLD_RESET
:
3122 tmr
->response
= TMR_FUNCTION_REJECTED
;
3125 pr_err("Uknown TMR function: 0x%02x.\n",
3127 tmr
->response
= TMR_FUNCTION_REJECTED
;
3131 cmd
->t_state
= TRANSPORT_ISTATE_PROCESSING
;
3132 cmd
->se_tfo
->queue_tm_rsp(cmd
);
3134 transport_cmd_check_stop_to_fabric(cmd
);
3137 int transport_generic_handle_tmr(
3140 INIT_WORK(&cmd
->work
, target_tmr_work
);
3141 queue_work(cmd
->se_dev
->tmr_wq
, &cmd
->work
);
3144 EXPORT_SYMBOL(transport_generic_handle_tmr
);